12056 (4) Ilmenite basalt
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Fact sheet
Description: 

12065 is a relatively coarse-grained, subophitic basalt. The crystallization sequence is olivine, metal, chromian spinel, followed by pyroxene in a peritectic reaction-relationship with olivine, ulvöspinel, plagioclase, ilmenite and mesostasis consisting of silica phase, Si+K-rich glass, fayalite, phosphate, metal and troilite. The texture is equigranular to subophitic with grain size about 0.5 mm for olivine, pyroxene, plagioclase and ilmenite. The late-stage mesostasis of 12056 consists of several percent symplectoid segregations of fayalite, alkali-rich glass, phosphate, ferroaugite, ilmenite, metal and troilite. The alkali-rich rich glass is an apparent immiscible liquid.

The sample weighed 121 grams before analysis and is 3.20±0.14 billion years old (Sm/Nd).

Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/

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Not known
Ma = Millions of years ago
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igneous
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